Fig. 4: Irreversible response of the chipless tag by counteracting the effects of gravity using a capillary paper absorbent. | Nature Communications

Fig. 4: Irreversible response of the chipless tag by counteracting the effects of gravity using a capillary paper absorbent.

From: Ecoresorbable chipless temperature-responsive tag made from biodegradable materials for sustainable IoT

Fig. 4

a Schematic representing the effects of gravity on the melting PCM with and without paper absorbent underneath. b Resonance frequency shift of the tag obtained by saturating with liquid coconut oil a paper absorbent of various sizes over the IDE area (n = 3). c Resonance frequency change of the chipless tag as a function of temperature during melting and refreezing of a frozen 50 μL coconut oil element placed over a 10 × 9 mm2 paper absorbent (Arrows indicate the evolution in temperature). d Resonance frequency shift of the tag with 50 μL of coconut oil placed over the paper absorbent as a function of temperature at 0°, 45° and 90° inclinations (n = 3).

Back to article page